尼羯磨 1.124

1.124

安受戒人處所法（應安眼見耳不聞處。其受戒人若在空、若隱沒、若離見聞處、若界外，不名受具。和尚尼及足數比丘尼亦如是。）

The procedure for stationing the ordinand: (She should be stationed in a place visible to the eyes but out of earshot. If the ordinand is in mid-air, hidden, out of sight and hearing, or outside the sīmā, it is not considered receiving ordination. The same applies to the upādhyāyinī and the bhikṣuṇīs making up the quorum.)